Has anyone ever caught you talking to yourself while you were day dreaming?

Happened to me. I was a teenager and waiting to get picked up from the library. I was sitting on a bench out front with no one around. I started day dreaming about being a famous author (irl horrible writer btw). Having a fake conversation out loud with an interviewer. I was going on about how I write from experiences and travel the world. I spoke about all my fans and so on... seriously was doing this for like 5 minutes. Until I start laughing at a funny question my imaginary interviewer asked when I notice this guy staring at me like I'm a crazy person. I was so much in my own world I had NO idea he was there! Lol so I ran away horrified and waited inside to get picked up. Anyone else have similar experiences?